Recovery of palladium

Abstract

Improvement on the recovery of palladium from aqueous acidic solutions employing ketoximes, including novel ether oximes and palladium complexes, comprising contacting the aqueous acidic solution containing the palladium with an organic solvent containing the oxime to form two immiscible phases, separating the organic and aqueous acidic phases and stripping the palladium values from the organic phase using an aqueous ammonia solution. The organic phase may contain phase transfer agents and modifiers.

We claim: 
     
       1. A palladium chloride complex with an ether oxime of the formula ##STR11## where R 4  is an alkadienyl group containing 8 to 16 carbon atoms, R 2  is a hydrocarbon group, halogen, or meta- or para-alkoxy group, and m is an integer of 0 to 4. 
     
     
       2. A palladium chloride complex as defined in claim 1, wherein R 4  is an alkadienyl group containing 8 to 16 carbon atoms, R 2  is R 4  or a saturated or unsaturated, straight or branched chain, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, aryloxy, or halogen group, and m is an integer of 0 to 4. 
     
     
       3. A palladium chloride complex as defined in claim 2, wherein R 4  is octadienyl and m is 1. 
     
     
       4. A palladium chloride complex as defined in claim 2, wherein R 4  and R 2  are octadienyl and m is 1. 
     
     
       5. A palladium chloride complex as defined in claim 4 wherein said R 2  group is in a position ortho relative to the R 4  O group. 
     
     
       6. The palladium chloride complex of 2-octadienyloxy-benzaldoxime. 
     
     
       7. A palladium chloride complex of an oxime of the formula ##STR12## where R is a hydrocarbon group, halogen, or meta- or para-alkoxy group, n is an integer of 0 to 5, and R' is hydrogen, an aliphatic or aromatic hydrocarbon or aliphatic substituted aromatic group, and when aliphatic is unsubstituted or substituted with an hydroxy, alkoxy, ester or nitrile substitutent, and the total number of carbon atoms in said oxime is from 7 to 26. 
     
     
       8. A palladium chloride complex as defined in claim 7 wherein the oxime is selected from the group consisting of p-(n-butyl)isobutyrophenone oxime   p-amylpropiophenone oxime   p-amylisobutyrophenone oxime   p-amyl(2-ethylhexano)phenone oxime   p-dodecylpropiophenone oxime   p-dodecylisobutyrophenone oxime   p-dodecyl(2-ethylhexano)phenone oxime.   
     
     
       9. An ether oxime having the formula ##STR13## where R 4  is an alkadienyl group containing 8 to 16 carbon atoms, R 2  is a hydrocarbon group, halogen, or meta- or para-alkoxy group, and m is an integer of 0 to 4. 
     
     
       10. An ether oxime as defined in claim 9 wherein R 4  is octadienyl and m is 1. 
     
     
       11. An ether oxime as defined in claim 9 wherein R 4  and R 2  are octadienyl and m is 1. 
     
     
       12. An ether oxime as defined in claim 11 wherein said R 2  group is in a position ortho relative to the R 4  O group. 
     
     
       13. 2-Octadienyloxybenzaldoxime. 
     
     
       14. An oxime selected from the group consisting of p-(n-butyl)isobutyrophenone oxime   p-amylpropiophenone oxime   p-amylisobutyrophenone oxime   p-amyl(2-ethylhexano)phenone oxime   p-dodecylpropiophenone oxime   p-dodecylisobutyrophenone oxime   p-dodecyl(2-ethylhexano)phenone oxime.